阅读说明：本技术 一种用于炼钢电炉出钢槽的浇注料及其制备方法 (Castable for steel-making electric furnace tapping channel and preparation method thereof ) 是由 李富朝 尹坤宝 崔亚蕾 邓俊 于 2020-05-29 设计创作，主要内容包括：本发明涉及炼钢电炉的出钢槽浇注料技术领域,且公开了一种用于炼钢电炉出钢槽的浇注料及其制备方法,包括以下重量份数配比的原料：特级矾土熟料颗粒60-72份、红柱石粉5-20份、碳化硅粉5-10份、α-氧化铝粉3-10份、石墨微粉5-10份、硅微粉4-8份、铝酸盐水泥4-10份、抗氧化剂2-10份、分散剂0.1-0.5份。该用于炼钢电炉出钢槽的浇注料及其制备方法,通过将特级高铝矾土熟料作为主要原料,其具备结构致密、高温体积稳定性好、耐火度高的特点,为制造出钢槽的浇注料提供了极大的便利,通过配入有适量的碳化硅、碳质材料,将碳化硅中硅的含量设置为大于百分之九十,由于碳化硅导热性好,且切削能力强,进一步增大了切削硬度。(The invention relates to the technical field of steel tapping channel castable of a steel-making electric furnace, and discloses a castable for the steel-making electric furnace steel tapping channel and a preparation method thereof, wherein the castable comprises the following raw materials in parts by weight: 60-72 parts of special-grade alumina clinker particles, 5-20 parts of andalusite powder, 5-10 parts of silicon carbide powder, 3-10 parts of alpha-alumina powder, 5-10 parts of graphite micropowder, 4-8 parts of silica micropowder, 4-10 parts of aluminate cement, 2-10 parts of antioxidant and 0.1-0.5 part of dispersant. According to the castable for the steel-making electric furnace steel tapping channel and the preparation method thereof, the super-grade high-alumina bauxite clinker is used as a main raw material, the castable has the characteristics of compact structure, good high-temperature volume stability and high refractoriness, great convenience is provided for manufacturing the castable for the steel-making electric furnace, the content of silicon in silicon carbide is set to be more than ninety percent by adding a proper amount of silicon carbide and carbon materials, and the cutting hardness is further increased due to good heat conductivity and strong cutting capability of the silicon carbide.)

1. The castable for the steel tapping channel of the steel-making electric furnace is characterized by comprising the following raw materials in parts by weight: 60-72 parts of special-grade alumina clinker particles, 5-20 parts of andalusite powder, 5-10 parts of silicon carbide powder, 3-10 parts of alpha-alumina powder, 5-10 parts of graphite micropowder, 4-8 parts of silica micropowder, 4-10 parts of aluminate cement, 2-10 parts of antioxidant and 0.1-0.5 part of dispersant.

2. The castable for the steel-making electric furnace tapping spout according to claim 1, wherein the antioxidant comprises metallic silicon powder and metallic aluminum powder.

3. The castable for the steel-making electric furnace tapping spout according to claim 1, characterized by comprising the following raw materials in parts by weight: the content of aluminum in the special-grade bauxite clinker is more than 85.0 percent, the content of aluminum in the andalusite powder is more than or equal to 55 percent, and the content of aluminum in the CA-70 cement is more than 70 percent.

4. The preparation method of the castable for the steel-making electric furnace tapping spout according to claim 1, characterized by comprising the following raw materials in parts by weight: the silicon content in the silicon micro powder is more than 95%, the purity of the silicon carbide is more than 95%, and the purity of the metal aluminum powder and the purity of the metal silicon powder are more than 90%.

5. A preparation method of a castable for a steel tapping channel of a steel-making electric furnace is characterized by comprising the following steps:

1) mixing special-grade alumina clinker particles, andalusite powder, silicon carbide powder, alpha-alumina powder, graphite micro powder, silicon micro powder, aluminate cement and an antioxidant dispersant together according to a proportion, dry-mixing for 1 minute, then rapidly stirring, adding water while stirring, slightly stopping after 2 minutes, cleaning mud materials adhered to stirring blades and the wall of a cylinder, and stirring again for 2 minutes, wherein the total stirring time is 5 minutes.

2) Taking the slurry stirred in the step 1) out of the pot, pouring the slurry into a die fixed on a vibrating table in advance until the upper edge of the die, starting the vibrating table, and filling the slurry while vibrating.

3) Stopping vibration, removing the slurry higher than the edge of the mold by using a scraper, and smoothing the surface of the mold, wherein the whole vibration time is controlled within 60-90 seconds.

4) And (3) curing the mold under the conditions that the relative humidity is not less than 90% and the temperature is 20 +/-1 ℃, demolding after curing for 24 hours, and curing for 24 hours under the same conditions.

Technical Field

The invention relates to a tapping channel castable for a steelmaking electric furnace, and the technical field of a manufacturing method and a using method of the tapping channel castable, in particular to a castable for a tapping channel of a steelmaking electric furnace and a preparation method thereof.

Background

The tapping spout is an important component of a steelmaking equipment system, the tapping spout bears the intermittent scouring of high-temperature molten steel in the using process, in order to prolong the service life of the tapping spout, the refractory material for the tapping spout is required to have good thermal shock resistance stability, molten steel scouring resistance and slag erosion resistance, the tapping spout of steel-making electric furnaces and open-hearth furnaces in China is generally built by clay bricks and common high-alumina bricks in the past, the service life is short, the molten steel erodes brick seams seriously, and then the refractory concrete integral spout combining alumina cement and water glass is used, so the service life is prolonged, but is still not ideal, the refractory concrete integral spout is often not resistant to molten steel scouring and has poor slag erosion resistance, and the slag adhesion is serious, and the refractory concrete integral spout is far from being suitable for the current increasingly harsh steelmaking conditions.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a castable for a steel-making electric furnace tapping channel and a preparation method thereof, which have the advantages of molten steel scouring resistance, erosion resistance, excellent thermal shock stability and the like, and solve the problems of low service life and serious erosion of molten steel to brick joints caused by the traditional common masonry of clay bricks and common high-alumina bricks.

(II) technical scheme

In order to realize the purposes of molten steel scouring resistance, erosion resistance and excellent thermal shock stability, the invention provides the following technical scheme: a castable for a steel tapping channel of a steelmaking electric furnace comprises the following raw materials in parts by weight: 60-72 parts of special-grade alumina clinker particles, 5-20 parts of andalusite powder, 5-10 parts of silicon carbide powder, 3-10 parts of alpha-alumina powder, 5-10 parts of graphite micropowder, 4-8 parts of silica micropowder, 4-10 parts of aluminate cement, 2-10 parts of antioxidant and 0.1-0.5 part of dispersant.

Preferably, the antioxidant comprises metal silicon powder and metal aluminum powder.

Preferably, the feed comprises the following raw materials in parts by weight: the content of aluminum in the special-grade bauxite clinker is more than 85.0 percent, the content of aluminum in the andalusite powder is more than or equal to 55 percent, and the content of aluminum in the CA-70 cement is more than 70 percent.

Preferably, the feed comprises the following raw materials in parts by weight: the content of aluminum in the special-grade bauxite clinker is more than 85.0 percent, the content of aluminum in the andalusite powder is more than or equal to 55 percent, and the content of aluminum in the CA-70 cement is more than 70 percent.

The invention provides a preparation method of a castable for a steel tapping channel of a steel-making electric furnace, which comprises the following steps:

1) mixing special-grade alumina clinker particles, andalusite powder, silicon carbide powder, alpha-alumina powder, graphite micro powder, silicon micro powder, aluminate cement and an antioxidant dispersant together according to a proportion, dry-mixing for 1 minute, then rapidly stirring, adding water while stirring, slightly stopping after 2 minutes, cleaning mud materials adhered to stirring blades and the wall of a cylinder, and stirring again for 2 minutes, wherein the total stirring time is 5 minutes.

2) Taking the slurry stirred in the step 1) out of the pot, pouring the slurry into a die fixed on a vibrating table in advance until the upper edge of the die, starting the vibrating table, and filling the slurry while vibrating.

3) Stopping vibration, removing the slurry higher than the edge of the die by using a scraper, and smoothing the surface of the die, wherein the whole vibration time is controlled within 60-90 seconds.

4) And (3) curing the mold under the conditions that the relative humidity is not less than 90% and the temperature is increased or decreased to 1 ℃, demolding after curing for 24 hours, and curing for 24 hours under the same conditions.

(III) advantageous effects

Compared with the prior art, the invention provides a castable for a steel tapping channel of a steel-making electric furnace and a preparation method thereof, and the castable has the following beneficial effects:

1. the castable for the steel-making electric furnace steel tapping channel and the preparation method thereof, by taking the super-grade bauxite chamotte as a main raw material, the castable has the characteristics of compact structure, good high-temperature volume stability and high refractoriness, provides great convenience for manufacturing the castable of the steel tapping channel, sets the content of silicon in silicon carbide to be more than ninety percent by adding a proper amount of silicon carbide and carbonaceous materials, has good thermal conductivity and strong cutting capability due to the silicon carbide, further increases the cutting hardness, and can promote sintering and help combustion by adding sintering agents and dispersing agents and adopting calcium aluminate cement for combination, so that the combustion of the castable is more sufficient.

2. The castable for the steel-making electric furnace tapping channel and the preparation method thereof, the antioxidant mainly comprises metal silicon powder and metal aluminum powder, the metal silicon powder can improve high temperature resistance, abrasion resistance and oxidation resistance, the metal aluminum powder has good adhesion and is not easy to separate, the metal silicon powder and the metal aluminum powder widely exist, the practicability is high, the application is wide, the increase of extra production cost is avoided, the die is maintained under the conditions that the relative humidity is not less than 90 percent and the temperature is 20 plus or minus 1 ℃, the aim of facilitating demoulding can be achieved after the maintenance is carried out for a certain time, the demoulding failure caused by the fact that the environmental humidity does not reach the standard is avoided, and the product has higher chemical stability, high purity, good insulating property, and simultaneously has the advantages of high acid-resistant mechanical strength, abrasion resistance and impact resistance, so that the erosion resistance of the castable is enhanced.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.